Electric-arc lamp.



No. 732,701 PATENTED JULY 7, 1903. R. BRODBRIGK & P. W. GORDON. ELECTRIC ARC LAMP.

APPLICATION FILED JAN. 6, 1903. NO MODEL.

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Patented July '7, 1903.

UNITED STATES PATENT OFFICE.

ROBERT BRODERIOK AND FRANK "W. GORDON, OF CLEVELAND, OHIO.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 732,701, dated July '7, 1903.

Application filed January 6, 1903. Serial No. 138,040. (No model.)

T0 on whom it may concern:

Be it known that we, ROBERT BRODERIOK and FRANK W. GORDON, citizens of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Are- Lamps; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being bad to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

This invention relates particularly to grav ity-feed arc-lights having a clutch controlling the movement of the upper carbon; and its objects are to form an improved clutch for the purpose stated, to form an improved automatic cut-out operating when the carbon has been consumed, and to form such other improvements as may be apparent in the following description and claims.

In the accompanying drawings, Figure l is an elevation of the parts of an arc-light embodying our invention, and Fig. 2 is a detail illustrating the operation of the cut-out.

Referring specifically to the drawings, 6 indicates the lower carbon supported by its arm 6, and 7 indicates the upper carbon, which passes through the porcelain support 8 and is engaged by a clutch comprising a ring 9, having at one side a dog 10, the tail of which is connected by rod 11 to an arm 12, projecting from the lower end of the core 13 within the solenoid 14. The core is cylindrical and hollow and receives the upper carbon therethrough. A connection is indicated at 14: between the solenoid and the rod 11 to carry the current from the former to the upper carbon through the clutch. Said connection is flexible to permit the play of the core. The lead-wires are indicated at 15 and 16, connected,'respectively, to the solenoid and the lowercarbon arm. A dash-pot is indicated at 17, fastened to the bottom of the spool of the solenoid, and its plunger 17 is attached to the clutch conveniently by the same pin 10 which bears against the side of the carbon.

When the carbon is nearly consumed and falls below the core and said projection, the catch drops in under the end of the core, as indicated in Fig. 2, which prevents any further feed and cuts out the lamp.

The operation of the lamp is as follows: The current entering through the solenoid lifts the core, causing the head of the dog to clutch the upper carbon in the ring and lift the same to establish the are. When the arc increases to such an extent as to break the our rent, the core drops, releasing the clutch and allowing the upper carbon to fall and redstablish the arc. The dash-pot cushions the movement, as will be understood. When the carbon feeds out to a small piece, the cut-out acts as above indicated.

It will be seen that the lamp has important advantages of simplicity, small size, and compactness and certainty and facility of operation.

What we claim as new, and desire to secure by Letters Patent, is.

1. In an arc-lamp and in combination, a solenoid-coil and its hollow core, an upper carbon within the core, a clutch for the carbon connected to and actuated by the core, and a conductive connection between the coil and the clutch, the latter being in circuit between the coil and the upper carbon.

2. In an arc-lamp and in combination, an upper carbon, a solenoid-coil and its hollow core surrounding said carbon, a clutch for the carbon, and a conductive connection between the coil and clutch, said connection being attached t0 the core and acting to operate the clutch.

3. In an arc-lamp, the combination with an upper carbon, and feeding means therefor including a solenoid-core, of a cut-out catch under the core, to stop the drop thereof, said catch having a projection bearing against the carbon and holding the catch out of engagement until the upper end of the carbon drops below the projection, substantially as described.

In testimony whereof we affix our signatures in presence of two witnesses.

ROBERT BRoD RIoK. FRANK w. eoaoon.

WVitnesses:

JOHN A. BOMMHARDT, Lo'rrrn NEWBURN. 

